Supporting plate



FIG. 1 is a perspective view of a supporting plate showing my new design;

FIG. 2 is another perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof;

FIG. 9 is an enlarged view of portion 9 shown in FIG. 2; and,

FIG. 10 is an enlarged view of portion 10 shown in FIG. 6.

The broken lines illustrate portions of the supporting plate that form no part of the claimed design. 

CLAIM The ornamental design for a supporting plate, as shown and described. 